I would guess if you have good snap ring pliers and you don't have to fight with that (if you check/replace/remove the 1-2 accumulator and or spring) and you have everything you need ready, and are not installing a cooler, you can do it in 2 or 3 hours, and that is a lot of do nothing time, letting the tranny drip, cleaning up the main control (but not dumping out the check balls or the small filter) and fiddling around.
I let mine sit overnight, I got an extra quart or so that dripped out of it, but to drop the pan, remove the filter, unplug the wiring, remove the main control, seperate the plate, drill the holes, remove the the 1-2 accumulator and replace it and the springs and put it back in, fight with the 2-3 accumulator, replace the plate, install the main control, plug in electrical, install filter and pan, there isn't much to it.
Some things you will fight with possibly besides the 1-2 accumulator (I put in a new piston and both new springs, you leave the one out from the documentation and it way easier) are making sure that you get the stepped shaft (I can't think of its name right now) in the proper place, and cleaning up after the Mercon shower (I have to find a better shampoo for it).
I installed a tranny cooler at the same time, and had to make a couple of trips for fittings for that, remove the radiator and other things, and I think I only had 5 hours into it all. I wasn't out to see how fast I could do it, and it was all new to me, but with all the documentation and pictures, it was easy. I used a sharpie to mark the holes, started with the smaller ones and triple checked everything I did.
To have someone "install" it, get a seperator place and the accumulator pistons and springs and have someone do it, I would guess they would charge 2 hours labor, maybe three. If you don't need the pistons then return them.